A dataset provided by the European Space Agency

Name OT2_mlehnert_2
Title The Nature of Star−formation in Halos: HI Bridges and Streams in the MW and the M81/M82 group


DOI https://doi.org/10.5270/esa-88ywt56
Author European Space Agency
Description We have now reached a relatively mature understanding of the physical
processes that regulate the ISM in galaxies, but we are woefully ignorant
of the details of the cycles between gas in and outside of galaxies. This
is unfortunate because understanding the gas physics in a wide variety
of environments is the key to determining the r^ance of the physical
mechanisms that have been invoked for driving galaxy evolution --
from the feeding of star formation through accretion of cold gas to the
regulation of star formation through the mechanical energy ejected by
massive stars and AGN. To help to overcome our ignorance about the nature
of star formation in different environments, in this case in galaxy
halos, we propose to use PACS to observe [CII] in many selected regions
of the bridges of HI in the nearby group of M81 and in the Magellanic
stream, two of the nearest intergalactic gas flows. These regions are
excellent targets for this type of study because it has a wide range of
HI column densities and stars have recently formed in the gas flow between
its galaxies. In response to the comments of the OT1 panel, the Magellanic
stream was added as a foil to the M81 group in that it has scant evidence
for recent star formation. [CII] is the main coolant and an excellent
tracer of the cold neutral medium in galaxies. By combining these data
with dust maps from Spitzer, Herschel, HI and H-alpha observations,
we will investigate the mass balance between the warm and cold neutral
medium to constrain the role of turbulence in regulating this balance,
which is key to the cooling and fragmentation of gas and to regulating
star formation. Investigating the nature of star formation in a halo of
a galaxy or group is one of the critical first steps in understanding
what occurs during the cosmological accretion of gas and thus help
determine what processes drive the evolution of the ensemble of galaxies.
Instrument PACS_PacsLineSpec_large
Temporal Coverage 2013-04-06T17:47:00Z/2013-04-08T07:09:32Z
Version SPG v14.2.0
Mission Description Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/h®erschel/
Date Published 2013-10-08T05:20:29Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013, The Nature Of Star−Formation In Halos: Hi Bridges And Streams In The Mw And The M81/M82 Group, SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-88ywt56